swift – 使用Sprite Kit的辅助功能(Voice Over)

概述我试图在具有固定板的益智游戏中添加对Voice Over accessibility的支持.但是,我无法让UIAccessibilityElements显示出来. 现在我在我的SKScene中覆盖了accessibilityElementAtIndex,accessibilityElementCount和indexOfAccessibilityElement. 他们返回一组可访问的元素： func 我试图在具有固定板的益智游戏中添加对Voice Over accessibility的支持.但是,我无法让UIAccessibilityElements显示出来.

现在我在我的SKScene中覆盖了accessibilityElementAtIndex,accessibilityElementCount和indexOfAccessibilityElement.

他们返回一组可访问的元素：

func loadAccessibleElements(){    self.isAccessibilityElement = false    let pIEces = getAllPIEces()    accessibleElements.removeAll(keepCapacity: false)    for pIEce in pIEces    {        let element = UIAccessibilityElement(accessibilityContainer: self.usableVIEw!)        element.accessibilityFrame = pIEce.getAccessibilityFrame()        element.accessibilityLabel = pIEce.getText()        element.accessibilityTraits = UIAccessibilityTraitbutton        accessibleElements.append(element)    }}

其中pIEce是SKSpriteNode的子类,并定义了getAccessibilityFrame：

func getAccessibilityFrame() -> CGRect{    return parentVIEw!.convertRect(frame,toVIEw: nil)}

现在,一个(尺寸错误的)辅助功能元素似乎出现在屏幕上错误的地方.

有人能指出我正确的方向吗？

非常感谢

编辑：
我已经尝试了一个Hack-ish工作,将UIVIEw放在SKVIEw上,UIbutton元素放在与SKSpriteNodes相同的位置.但是,可访问性仍然不希望工作.视图按如下方式加载：

func loadAccessibilityVIEw(){    vIEw.isAccessibilityElement = false    vIEw.accessibilityElementsHIDden = false    skVIEw.accessibilityElementsHIDden = false    let accessibleSubvIEw = UIVIEw(frame: vIEw.frame)    accessibleSubvIEw.userInteractionEnabled = true    accessibleSubvIEw.isAccessibilityElement = false    vIEw.addSubvIEw(accessibleSubvIEw)    vIEw.bringSubvIEwToFront(accessibleSubvIEw)    let pIEces = (skVIEw.scene! as! GameScene).getAllPIEces()    for pIEce in pIEces    {        let pIEcebutton = UIbutton(frame: pIEce.getAccessibilityFrame())        pIEcebutton.isAccessibilityElement = true        pIEcebutton.accessibilityElementsHIDden = false        pIEcebutton.accessibilityTraits = UIAccessibilityTraitbutton        pIEcebutton.setTitle(pIEce.getText(),forState: UIControlState.normal)        pIEcebutton.setBackgroundImage(UIImage(named: "blue-button"),forState: UIControlState.normal)        pIEcebutton.Alpha = 0.2        pIEcebutton.accessibilityLabel = pIEce.getText()        pIEcebutton.accessibilityFrame = pIEcebutton.frame        pIEcebutton.addTarget(self,action: Selector("dIDTap:"),forControlEvents: UIControlEvents.touchUpInsIDe)        accessibleSubvIEw.addSubvIEw(pIEcebutton)    }    UIAccessibilityPostNotification(UIAccessibilityScreenChangednotification,nil)}

按钮放置正确,但可访问性根本无法正常工作.似乎有些东西阻止它起作用.

解决方法 我搜索到如何使用SpriteKit在Swift中实现VoiceOver的描述是徒劳的,所以我终于想出了如何做到这一点.这里有一些工作代码,可以在添加到SKScene类时将SKNode转换为可访问的按钮：

// Add the following code to a scene where you want to make the SKNode variable named “leave” an accessible button// leave must already be initialized and added as a child of the scene,or a child of other SKNodes in the scene// screenHeight must already be defined as the height of the device screen,in points// Accessibilityprivate var accessibleElements: [UIAccessibilityElement] = []private func nodetoDevicePointsFrame(node: SKNode) -> CGRect {    // first convert from frame in SKNode to frame in SKScene's coordinates    var sceneFrame = node.frame    sceneFrame.origin = node.scene!.convertPoint(node.frame.origin,fromNode: node.parent!)    // convert frame from SKScene coordinates to device points    // sprite kit scene origin is in lower left,accessibility device screen origin is at upper left    // assumes scene is initialized using SKScenescaleMode.Fill using dimensions same as device points    var deviceFrame = sceneFrame    deviceFrame.origin.y = CGfloat(screenHeight-1) - (sceneFrame.origin.y + sceneFrame.size.height)    return deviceFrame}private func initaccessibility() {    if accessibleElements.count == 0 {        let accessibleLeave = UIAccessibilityElement(accessibilityContainer: self.vIEw!)        accessibleLeave.accessibilityFrame = nodetoDevicePointsFrame(leave)        accessibleLeave.accessibilityTraits = UIAccessibilityTraitbutton        accessibleLeave.accessibilityLabel = “leave” // the accessible name of the button        accessibleElements.append(accessibleLeave)    }}overrIDe func dIDMovetoVIEw(vIEw: SKVIEw) {    self.isAccessibilityElement = false    leave.isAccessibilityElement = true}overrIDe func willMoveFromVIEw(vIEw: SKVIEw) {    accessibleElements = []}overrIDe func accessibilityElementCount() -> Int {    initaccessibility()    return accessibleElements.count}overrIDe func accessibilityElementAtIndex(index: Int) -> AnyObject? {    initaccessibility()    if (index < accessibleElements.count) {        return accessibleElements[index] as AnyObject    } else {        return nil    }}overrIDe func indexOfAccessibilityElement(element: AnyObject) -> Int {    initaccessibility()    return accessibleElements.indexOf(element as! UIAccessibilityElement)!}

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